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P. BROTHERHOOD.

COMPOUND ENGINE. No. 332,484. Patented Dec. 15,1885.

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UNITED STATES PATENT @EETQE.

PETER BROTHERHOOD, OF LAMBETH, COUNTY OF SURREY, ENGLAND.

COMPOUND ENGINE.

ZZPECIFICAIION forming part of Letters Patent No. 332,484, datedDecember 15,1885.

Application filed February 1'2, 1885. Serial No. 155,742.

To all whom it may concern.-

Be it known that 1, PETER BROTHERHOOD, a citizen of England, residing atLainbeth, in the county of Surrey, England, have invented a new anduseful Improved Arrangement of Cylinders and Slide -Valve for CompoundEngines, (for which I have made application for a patent in GreatBritain, dated October 17, 1884, No. 13,756,) of which the following isa specification.

My invention relates to an arrangement of cylinders and slide-valvesuited for the compound action of steam or other elastic fluid underpressurethat is to say, for the action of the fluid first in a smallcylinder and afterward in a larger cylinder, in which it eX- pands.

The object which I have in view is to simplify the construction andaction of the slidevalve and ports and passages which it governs, toavoid waste of the working-fluid, and to maintain a strain on theconnecting-rod joints always in a direction of thrust.

The accompanying drawing is a section through the slide-valve, the smallor highpressure cylinder, and part of the larger or expansion cylinderarranged according to my invention. The connecting-rod A may bespherically jointed, as shown, to the low-pressure piston B; or it mightbe jointed with a pin passing through an eye in the usual way, and inlike manner the rod D, which works the slide-valve from an eccentric,may be jointed to slide; or, instead of connectingrods A and D, such asare suitable for connecting directly to cranks or eccentrics, the

'piston and slide-valve may have rigid rods,

according to the arrangement of engine to which the invention isapplied. The piston C of the small cylinder has a rod, E, which maysimply butt against the larger piston, B, but is preferably attached toit by a collar, as shown at c, with certain freedom of jointing, toallow for slight errors of eccentricity of the two cylinders. Theslide-valve F is cylindrical, with passages through its end, asindicated by the dotted lines at f. The front end of the slide-valve islarger in area than the hinder end, so that there is always a pressureurging the slide-valve forward, and so imposing a thrust-strain on theslide- (No model.) Patented in England October 1.7, 1884, No. 13,756.

valve rod. The steam or working-fluid is supplied by the passage G to anannular eavity, g, surrounding the slide-valve, from which cavity it hasfree communication by a passage, H, to the hinder end of the smallcylinder, so that there is always full pressure on the piston G, tendingto force it forward. The slide-valve F governs the port K, leading tothefront end of the small cylinder, and the port L, leading to thehinder end of the large cylinder. \Vhen the slide mov es loaek ward, itfirst closes L, then it puts K in communication with g, and finally ituncovers L, putt-ing it in communication with the space M. In thiscondition the pressure on both sides of the piston O is equal, and thepressure behind the piston B being relieved by the escape of the exhaustthrough L to M, the pistons are moved back by the action of the crank towhich they are connected, fluid entering the small cylinder in front ofthe piston C. \Vhen the slide moves forward again, it closes thecommunication from L to M, and from g to K, and puts K and L incommunication, as shown in the drawing. The full pressure new acts onthe back of the piston (J, while the fluid in front of it loses pressureas it expands into the larger cylinder and acts on the back of thepiston B. Both pistons are thus propelled, imparting power to the crank.

Although I have shown only one slide-valve with one small cylinder andpart of one large singleacting cylinder, it is to be understood thattwo, three, or more sets of these are to be arranged in connection withone crank-shaft. Thus three or more sets might be arranged side by side,each acting on a separate crank on the shaft; or they might be arrangedradially around the shaft, as in the Brotherhood engine, all the pistonsacting on a single crank.

Having thus described the nature of my in Vention and the best means Iknow for carrying the same out in practice, what I claim is- Thecombination of a small or high-pressure cylinder with a larger orexpansion cylinder, single-acting and in line with the small cylinder,and a slide-valve and ports so arranged that while the full pressureacts constantly on the back of the smaller piston it acts on its frontduring;v the back-stroke, the to this specification, in the presenceoftwo sublarger cylinder then discharging exhaust, and scribingWitnesses, this 22d day of January, during the forward stroke the fluidthat had A. D. 1885. acted in front of the smaller piston expands 5 intothe larger cylinder, acting on the larger Witnesses:

piston, substantially as herein described. JNO. P. M. MILLARD, Intestimony whereoflhave signed my name HERBERT E. DALE.-

PETER BROTHERHOOD.

